Skiving machine



July 29,1941. E, RAY 2,250,498

SKIVING MACHINE Filed Jan. 23, 1940 c f W/EAUZ; 42 51 22;? 941%.

Patented July 29, 1941 .SKIVING MACHINE Eugene J. Ray, Beverly, Mass.,assignor to United Shoe Machinery Corporation, Borough of Flemington, N.J., a corporation of New Jersey Application January 23, 1940, Serial No.315,222 In Canada January 16, 1940 2 Claims.

This invention relates to skiving machines and is herein illustrated asembodied in a machine having a tubular knife, said machine beingparticularly adapted to skive pieces of sheet material, such as leather,which are to be incorporated in boots and shoes.

In machines of this general type, it is sometimes desirable, whenchanging from one kind of work to another, to remove the feed roll andreplace it with one of a different type, for example, to replace a feedroll having radial slots with a roll having a knurled surface; andhitherto it has been necessary to remove certain parts of the machinefrom their adjusted positions and then to readjust such parts in orderto replace one feed roll with another. In accordance with the presentinvention, the Whole feed roll assembly may readily be removed andreplaced without disturbing any adjusted part of the machine.

Referring to the accompanying drawing,

Fig. 1 is a View looking down upon the workengaging parts of a machine,in which the present invention is embodied, the overhanging arm with itswork presser having been omitted, and parts of the main and auxiliaryframes of the machine being shown in section;

Fig. 2 is an end elevation of the feed roll driving link; and

Fig. 3 is a detail, partly in section and partly in elevation, showingmore particularly how the feed roll assembly is held in its carrier by ascrew having a long head, which projects out through an opening in theframe of the machine.

The machine is of the general type shown in United States Letters PatentNo. 1,469,849, granted October 9, 1923, upon an application filed in myname, in that it comprises a rotary tubular knife 4, a feed roll 9located partly within the knife, and a presser, not shown, which holdsthe work support against the knife. The machine is an improvement uponthe machine of my prior application Serial No. 268,718, filed April 19,1939, the improved construction permitting ready removal of the feedroll assembly.

In the present machine, as in the machine of the application, thecarrier for the feed roll assembly is angularly movable about the axisof a stationary but longitudinally adjustable rod 1 and is acted upon bya spring, not shown, which tends at all times to swing the carrier up asfar as a stop, not shown, will permit. This construction normally holdsthe carrier in the position shown, but permits the carrier, and with itthe feed roll, to yield about the axis of the rod I, thus providing forbodily yielding movement of the feed roll toward and from the operativeportion of the edge of the knife. The feed roll is also mounted forangular or tilting movement about an inclined axis, which passes througha point 2 at one end of the uppermost element of the roll. To this end,the roll is rotatably mounted on the stem of a screw II, the head, atthe farther end of which as viewed in Fig. 3, being seated in a socketin the farther end of the feed roll. The near end of the screw isthreaded into a split portion of a block 1 3 and is held firmly by apinch screw IS. The block l3 has integral with it a cylindrical stem I1rotatably mounted in a bore formed in the part of the feed roll carrier5. The bore is inclined up from left to right, as viewed in Fig. 3, andits axis passes through point a (Fig. l). A screw l9, threaded into oneend of the stem 11, holds the stem in the inclined bore, this screwbeingsomewhat different from that of the machine of the application. The rollis normally held in the angular position shown with respect to theinclined axis which passes through the point 2, by a torsion spring 2|which is wound about a small rod 23, one end of the spring being fast toa collar 25 which is fastened to the rod. The other end of the springextends beneath and exerts an upward pressure upon a member carried onthe underside of the block I 3, said torsion spring at all times urgingthe block I 3, and with it the feed roll, upwardly about the aXis ofthestem I"! as far as a stop, not shown, on the carrier 5 will permit.The rod 23 may be turned about its longitudinal axis and locked inposition to vary the force with which it tends to swing one end of theroll upward. The feed roll shown is slotted circumferentially, and acomb 21 mounted on the block l3 has teeth which enter the slots. Thefeed roll, as described above, is capable-of yielding bodily up and downand of tilting about the inclined axis of the stem [1, such movementsbeing imparted to it by pressure exerted upon it through the work by apresser foot, not shown. The feed roll is driven from the end of arotating shaft 29. The end of this shaft is provided with a socket andwith alined slots which intersect the socket to receive an enlarged endor ball and a cross pin 39 at one end of a small link 3|, the other endof which has another ball and pin which are received in a socket and aslot in the adjacent end of the feed roll. In the machine of theapplication, the pins which correspond to the cross pins 30 are freelyslidable in and out of bores in the balls at the ends of the link.

When it is desired to remove a feed roll assembly and replace it by onehaving a different feed roll, the auxiliary frame 33 is unlocked byturning the handle 35; and the auxiliary frame, which is pivoted to themain frame 31 about an upright stud, not shown, at the rear of themachine, is swung to the left so as to give access to the feed roll. Itis then necessary to loosen a collar, not shown, on the rod 1, whichholds the carrier from moving longitudinally of the rod, to withdraw therod, one end of which is screwed into a bore in the auxiliary frame; andthen, having disengaged the feed roll 9 from the short link 3|, byswinging the feed roll down about the axis of its stem H, to remove as aunit the carrier 5, the block l3 and the parts including the feed rollcarried thereby. It is then possible to unscrew the small screw(corresponding to the screw l9), which holds the stem I! in its socket,and to remove the feed roll assembly which consists of the block I3 andthe feed roll mounted upon it. After the feed roll assembly has beenreplaced by another one, it is necessary to reverse the proceduredescribed above, including screwing the rod 1 back into exactly theadjusted position which it occupied before, and refasten on the rod thecollar referred to above which prevents longitudinal movement of thecarrier 5 on the rod, and this procedure is hampered more or less by thefact that the cross pins at the ends of the link 3| are loose and arehence liable, during the handling of the link 3|, to fall out of theholes or bores through which they pass. This partial dismantling andreassembling of the machine described above requires the services of askilled mechanic, who is familiar with the machine and can accuratelyreadjust the parts.

In order to facilitate removal and replacement of the feed rollassembly, the frame of the present machine is provided with an opening32 in line with the stem I! of the feed roll assembly; and the longscrew I9 is provided, the head of which projects through the opening soas to be readily accessible. In order to prevent the falling out of thecross pins 30 when the link 3| is being handled, each cross pin isprovided at its middle with a comparatively wide annular groove, intowhich extends one end of a small screw 39 so that the pins, while freeto slide to some extent, cannot fall out of their bores.

When, now, it is desired to remove the feed roll assembly and replace itby one having a different feed roll, the auxiliary frame is swung out,the rod 23 is turned so as to swing the extended end of the torsionspring 21 down out of the way; the feed roll 9 is swung down about theaxis of its stem I! to disengage it from the link 3!, which may then beremoved, the cross pins 30 remaining in place in the enlarged ends ofthe link; and then the screw 19 is unscrewed. The whole feed rollassembly may then be removed and replaced without removing the rollcarrier 5, which remains in its adjusted position on the rod 1.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A machine of the class described having in combination, a tubularknife, a feed roll located partly within the knife, a block upon whichthe feed roll is rotatably mounted, said block having a cylindrical stemabout the axis of which the block and roll may be tilted, a spring fornormally holding up one end of the feed roll, a link for driving theroll, said link having an enlarged end provided with a cross bore, across pin slidable in the bore, means for limiting said slidingmovement, a carrier having a socket to receive the cylindrical stem ofthe block, there being in the frame of the machine an opening in linewith the axis of the socket, and a screw for holding the stem in thesocket, said screw having a head which extends out through said opening.

2. A machine of the class described having in combination a main frame,a tubular knife rotatably mounted in said main frame, an auxiliary framepivoted to the main frame about a substantially vertical axis andcapable of being swung out to expose the elements mounted in it, a feedroll normally located partly within the knife, a block upon which thefeed roll is rotatably mounted, said block having a cylindrical stemabout the axis of which the block and roll may be tilted, the block androll forming a feed roll assembly, a spring for holding up one end ofthe block, means for mounting the spring in such manner that it may bewithdrawn from contact with the block, a driving link having a readilyseparable universal-joint connection with the roll, an adjustablecarrier mounted on the auxiliary frame and having a socket to receivethe cylindrical stem of the block, and a screw for holding the stem inthe socket, the frame of the machine having in it an opening in linewith the screw whereby, after the auxiliary frame has been swung out,the feed roll assembly may be removed and replaced while retaining thecarrier in its adjusted position.

EUGENE J. RAY.

